Regensburg Bf 109 G-6 assembly places in may 1944

[Kuba Plewka]

Gentlemen!

I'm looking for some informations about Gustav production in Mtt. Regensburg around end of april and may 1944r.

Where did the final assembly exactly took place?
Where did the fuselage come from, who manufactured tail sectios?
Was it one or more tail sections and fuselage manufacturers?
Where were those Gustavs test flown? I mean specially 163 xxx block.

Thanks for any advice and info.

best regards
Kuba Plewka